<template>
  <div class="pos">
    <el-row>
      <el-col :span='7' class="pos-order" id="order-list">
        <el-tabs>
          <el-tab-pane label="点餐">
            <el-table :data="tableData" border style="width:100%">
              <el-table-column prop="goodsName" label="商品名称"></el-table-column>
              <el-table-column prop="count" label="数量" width="50"></el-table-column>
              <el-table-column prop="price" label="金额" width="70"></el-table-column>
              <el-table-column label="操作" width="100" fixed="right">
                <template slot-scope="scope">
                  <el-button type="text" size="small " @click="delSinglaGoods(scope.row)">删除</el-button>
                  <el-button type="text" size="small" @click="addOrderList(scope.row)">增加</el-button>
                </template>
              </el-table-column>
            </el-table>
            <div class="totalDiv">
              <span class="w">
                <small> 数量：</small>{{totalCount}}</span>
              <span class="w">
                <small>金额：</small>{{totalMoney}}元</span>
            </div>
            <div class="div-btn">
              <el-button type="danger" @click="delAllGoods">删除</el-button>
              <el-button type="success" @click="chechout">结账</el-button>
            </div>
          </el-tab-pane>
          <el-tab-pane label="外卖">
             <el-table :data="tableData" border style="width:100%">
              <el-table-column prop="goodsName" label="商品名称"></el-table-column>
              <el-table-column prop="count" label="数量" width="50"></el-table-column>
              <el-table-column prop="price" label="金额" width="70"></el-table-column>
              <el-table-column label="操作" width="100" fixed="right">
                <template slot-scope="scope">
                  <el-button type="text" size="small " @click="delSinglaGoods(scope.row)">删除</el-button>
                  <el-button type="text" size="small" @click="addOrderList(scope.row)">增加</el-button>
                </template>
              </el-table-column>
            </el-table>
            <div class="totalDiv">
              <span class="w">
                <small> 数量：</small>{{totalCount}}</span>
              <span class="w">
                <small>金额：</small>{{totalMoney}}元</span>
            </div>
            <div class="div-btn">
              <el-button type="danger" @click="delAllGoods">删除</el-button>
              <el-button type="success" @click="chechout">结账</el-button>
            </div>
          </el-tab-pane>
        </el-tabs>

      </el-col>
      <el-col :span="17">
        <div class="often-goods">
          <div class="title">常用商品</div>
          <div class="often-goods-list">
            <ul>
              <li v-for="goods in oftenGoods" @click="addOrderList(goods)">
                <span>{{goods.goodsName}}</span>
                <span class="o-price">￥{{goods.price}}元</span>
              </li>
            </ul>
          </div>
        </div>

        <div class="goods-type">
          <el-tabs>
            <el-tab-pane label="汉堡">

              <div class="cookList">
                <ul class='cookList'>
                  <li v-for="goods in type0Goods" @click="addOrderList(goods)">
                    <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                    <span class="foodName">{{goods.goodsName}}</span>
                    <span class="foodPrice">￥{{goods.price}}元</span>
                  </li>
                </ul>
              </div>

            </el-tab-pane>
            <el-tab-pane label="小食">
              <ul class='cookList'>
                <li v-for="goods in type1Goods" @click="addOrderList(goods)">
                  <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                  <span class="foodName">{{goods.goodsName}}</span>
                  <span class="foodPrice">￥{{goods.price}}元</span>
                </li>
              </ul>
            </el-tab-pane>
            <el-tab-pane label="饮料">
              <ul class='cookList'>
                <li v-for="goods in type2Goods" @click="addOrderList(goods)">
                  <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                  <span class="foodName">{{goods.goodsName}}</span>
                  <span class="foodPrice">￥{{goods.price}}元</span>
                </li>
              </ul>
            </el-tab-pane>
            <el-tab-pane label="套餐">
              <ul class='cookList'>
                <li v-for="goods in type3Goods" @click="addOrderList(goods)">
                  <span class="foodImg"><img :src="goods.goodsImg" width="100%"></span>
                  <span class="foodName">{{goods.goodsName}}</span>
                  <span class="foodPrice">￥{{goods.price}}元</span>
                </li>
              </ul>
            </el-tab-pane>
          </el-tabs>
        </div>

      </el-col>
    </el-row>

  </div>
</template>

<script>
import axios from 'axios'
export default {
  name: 'pos',
  data() {
    return {
      tableData: [],
      oftenGoods: [],
      type0Goods: [],
      type1Goods: [],
      type2Goods: [],
      type3Goods: [],
      totalMoney: 0,
      totalCount: 0
    }
  },
  created: function() {
    axios
      .get('http://jspang.com/DemoApi/oftenGoods.php')
      .then(reponse => {
        // console.log(reponse);
        this.oftenGoods = reponse.data
      })
      .catch(error => {
        // console.log(error);
        alert('网络错误，不能访问')
      })

    axios
      .get('http://jspang.com/DemoApi/typeGoods.php')
      .then(reponse => {
        // console.log(reponse);
        this.type0Goods = reponse.data[0]
        this.type1Goods = reponse.data[1]
        this.type2Goods = reponse.data[2]
        this.type3Goods = reponse.data[3]
      })
      .catch(error => {
        // console.log(error);
        alert('网络错误，不能访问')
      })
  },
  mounted: function() {
    var orderHeiht = document.body.clientHeight
    document.getElementById('order-list').style.height = orderHeiht + 'px'
  },
  methods: {
    //添加订单列表的方法
    addOrderList(goods) {
      this.totalCount = 0 //汇总数量清0
      this.totalMoney = 0
      let isHave = false
      //判断是否这个商品已经存在于订单列表
      for (let i = 0; i < this.tableData.length; i++) {
        console.log(this.tableData[i].goodsId)
        if (this.tableData[i].goodsId == goods.goodsId) {
          isHave = true //存在
        }
      }
      //根据isHave的值判断订单列表中是否已经有此商品
      if (isHave) {
        //存在就进行数量添加
        let arr = this.tableData.filter(o => o.goodsId == goods.goodsId)
        arr[0].count++
        //console.log(arr);
      } else {
        //不存在就推入数组
        let newGoods = {
          goodsId: goods.goodsId,
          goodsName: goods.goodsName,
          price: goods.price,
          count: 1
        }
        this.tableData.push(newGoods)
      }
         this.getAllMoney();
    },
    //删除多个商品
    delSinglaGoods(goods) {
      this.tableData = this.tableData.filter(o => o.goodsId != goods.goodsId)
      this.getAllMoney();
    },
    delAllGoods(){
      this.tableData=[];
      this.totalCount=0;
      this.totalMoney=0;
    },
    //模拟结账
    chechout(){
      if(this.totalCount!=0){
      this.tableData=[];
      this.totalCount=0;
      this.totalMoney=0;
      this.$message({
        message: '结账成功，感谢你为店里出来了一份力!',
        type: 'success'
      });
      }else{
        this.$message.error('不能空结账，老板了解你急切的心情!');
      }
    },
    //汇总数量和金额
    getAllMoney() {
      this.totalCount = 0
      this.totalMoney = 0
      if (this.tableData) {
        //进行数量和价格的汇总计算
        this.tableData.forEach(element => {
          this.totalCount += element.count
          this.totalMoney = this.totalMoney + element.price * element.count
        })
      }
    }
  }
}
</script>


<style scoped>
.pos-order {
  background-color: #f9fafc;
  border-right: 1px sloid #c0ccda;
}
.div-btn {
  margin-top: 10px;
}
.title {
  height: 20px;
  border-bottom: 1px solid #d3dce6;
  background-color: #f9fafc;
  padding: 10px;
  text-align: left;
}
.often-goods-list ul li {
  list-style: none;
  float: left;
  border: 1px solid #f9fafc;
  padding: 10px;
  margin: 10px;
  background-color: #fff;
}
.o-price {
  color: #58b7ff;
}
.goods-type {
  clear: both;
}
.cookList li {
  list-style: none;
  width: 23%;
  border: 1px solid #e5e9f2;
  height: auot;
  overflow: hidden;
  background-color: #fff;
  padding: 2px;
  float: left;
  margin: 2px;
  cursor: pointer;
}
.cookList li span {
  display: block;
  float: left;
}
.foodImg {
  width: 40%;
}
.foodName {
  font-size: 18px;
  padding-left: 10px;
  color: brown;
}
.foodPrice {
  font-size: 16px;
  padding-left: 10px;
  padding-top: 10px;
}
.often-goods {
  cursor: pointer;
}
.totalDiv {
  background-color: #fff;
  padding: 10px;
  border-bottom: 1px solid #d3dce6;
}
.w {
  margin: 20px;
}
</style>
